Retailers take sides in the battle of mobile payment technology, with some disabling NFC sensors in favor of an app that tracks customer data. Also, Amazon takes on Chromecast, and Fitbit launches new wristbands.

Retailers take sides in the battle of mobile payment technology, with some shutting down NFC sensors to block Apple Pay and Google Wallet in favor of an app that tracks customer data. Also, Amazon takes on Chromecast, and Fitbit launches new wristbands.